class ModifyKeContentsForMarkdown < ActiveRecord::Migration[5.2]
  include ActionView::Helpers::SanitizeHelper
  def change
    def ke_transform_to_md content
      return content if content.blank?
      s_contents = sanitize(content, tags: %w(img a span table td tr tbody pre), attributes: %w(src href target style))
      s_contents.gsub(">\n<", "><").gsub(/^\n/, "").gsub(" ", "").gsub(/(\n)+/, "<br />")
          .gsub("\t", "").gsub("\n", "").gsub("    ", "&nbsp;&nbsp;&nbsp;&nbsp;").gsub(/(<br\s?\/?>)+/, "<br />")
    end
    #
    # # 课程讨论区
    # MessageDetail.find_each do |m|
    #   content = ke_transform_to_md m.content
    #   m.update_column(:content, content)
    # end

    #试卷的标题
    # ExerciseQuestion.find_each do |eq|
    #   question_title = ke_transform_to_md eq.question_title
    #   eq.update_column(:question_title, question_title)
    # end

    # # 试卷的答案
    # ExerciseStandardAnswer.find_each do |esa|
    #   answer_text = ke_transform_to_md esa.answer_text
    #   esa.update_column(:answer_text, answer_text)
    # end
    #
    # 试卷题库的问题标题
    ExerciseBankQuestion.find_each do |ebq|
      question_title = ke_transform_to_md ebq.question_title
      ebq.update_column(:question_title, question_title)
    end
    #
    # # 试卷答案
    # ExerciseBankStandardAnswer.find_each do |ebsa|
    #   answer_text = ke_transform_to_md ebsa.answer_text
    #   ebsa.update_column(:answer_text, answer_text)
    # end

    # # 问卷的标题
    # PollQuestion.find_each do |pq|
    #   question_title = ke_transform_to_md pq.question_title
    #   pq.update_column(:question_title, question_title)
    # end

  end
end